Posted By: Clanton
Rod bearing pic - 12/04/13 09:06 PM
Let me know what you think of the pattern.
![7946876-rodbearing.jpg Attached picture 7946876-rodbearing.jpg](https://board.moparts.org/ubbthreads/upload2/7946876-rodbearing.jpg)
![7946876-rodbearing.jpg Attached picture 7946876-rodbearing.jpg](https://board.moparts.org/ubbthreads/upload2/7946876-rodbearing.jpg)
Quote:Actually, that's a pretty good pic. Polish the crank, fresh bearings, and party down. Again, do the other bearings look like that?
I will work on a better pic.I wonder if the pattern is from the rod walking back/forth on the crank..003 clearence,.025 side,15/40 oil,hv pump,80 psi.
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i'd want to know why that cap insert is worn on one side.
Quote:No 2 ways that the cap/rod/crank journal are not perfectly straight. That's a gimmie. IMO, it is exaggerated by the high bearing wear and coloration of the majority of what's left of the top bearing surface. Most bearing wear charts will show that surface consistency as being caused by poor journal finish - whether the crank was new or not. A better determination can be made when he pulls the other caps off. If they all look similar to this one, I'm stickin with journal finish.Quote:
i'd want to know why that cap insert is worn on one side.
I posted the pic to find that out if I can.I can not measure the crank with the engine in the car very easy but all rods & bearings were measured with a good bore gauge to begin with.
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From what I see it doesn't look good, that's for sure.
Quote:I saw that too, but the pic does not show the radius side ( crank fillet side )of the cap or rod, so IMO, inconclusive.
I wont say anything till I see the others... but the
one edge looks like it doesnt have the radius for
the crank or enough radius for it
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I wont say anything till I see the others... but the
one edge looks like it doesnt have the radius for
the crank or enough radius for it
![]()
Quote:Quote:
I wont say anything till I see the others... but the
one edge looks like it doesnt have the radius for
the crank or enough radius for it
![]()
The radius on the bearings were turned down to clear the crank.[SLP-8-7135ch .010]
I will try to do 2 more rods on another crank throw.
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Typical of an engine that is constantly being loaded and unloaded by RPM and torque loads and compression pressure in the cylinders.We see this on our blower engine frequently.Sometimes the rods will kick to the crank and also show radius marking.![]()
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I wont say anything till I see the others... but the
one edge looks like it doesnt have the radius for
the crank or enough radius for it
![]()
The radius on the bearings were turned down to clear the crank.[SLP-8-7135ch .010]
I will try to do 2 more rods on another crank throw.
Did you verify that they clear the fillet... put a
slight side pressure on the rod and use a feeler gauge
between the crank and rod... I had to cut the bearings
on a couple of my engines and at first I thought I
had it till I checked it with the feeler gauge and
had to go back and add more
![]()
Quote:Hmmm? Unfortunately, didn't save any bearings for comparative pics, but ran Clevite #CB-481-HN's in my blown small block with twice the runs as the OP's and they didn't look like that. All runs were with boost in the 15 - 18 lb range and a few passes pinned a 25 lb boost gauge ( smaller blower pulley). Bearings had enough radius out of the box to fit a factory Scat crank. I
Typical of an engine that is constantly being loaded and unloaded by RPM and torque loads and compression pressure in the cylinders.We see this on our blower engine frequently.Sometimes the rods will kick to the crank and also show radius marking.![]()
Quote:Good post
Don't know if this helps anyone out so just throwing it out there. There are multiple images for some of these pictures.
http://catalog.mahleclevite.com/bearing/
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Quote:
Don't know if this helps anyone out so just throwing it out there. There are multiple images for some of these pictures.
http://catalog.mahleclevite.com/bearing/
That's a cool link for sure. Looks kind of like #24.
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Typical,don't idle the engine too low.![]()
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Quote:Quote:
Typical,don't idle the engine too low.![]()
![]()
The idle is 1100+ and 1k in gear.![]()
Quote:Quote:Quote:
Typical,don't idle the engine too low.![]()
![]()
The idle is 1100+ and 1k in gear.![]()
You like to hear that rump,rump![]()